FNUS71 KBOX 180819 FWSBOX Spot Forecast for Cuttyhunk_Rx_Fire_20260518...MassWildlife National Weather Service Boston/Norton MA 419 AM EDT Mon May 18 2026 Forecast is based on ignition time of 0500 EDT on May 18. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Dry conditions today with east winds 10-15 mph shifting to SE-S this afternoon. Minimum relative humidity will be 70-75 percent. Mixing heights will be under 1000 ft with poor smoke dispersal. .TODAY... Sky/weather.........Mostly sunny. CWR.................1 percent. Max temperature.....Around 65. Min humidity........75 percent. Dewpoint............52. Max apparent temp...61. Surface winds (mph).East winds 12 to 13 mph shifting to the south around 12 mph late in the afternoon. Wind (20 ft)........East winds 12 to 13 mph shifting to the south around 12 mph late in the afternoon. Mixing height.......400 ft AGL. Transport winds.....East 12 to 17 mph shifting to the south 12 to 14 mph late in the afternoon. Smoke dispersal.....Poor (3600 knot-ft). LVORI...............4. ADI.................13 to 19. CEILING (KFT).......25 decreasing to 20 late in the afternoon. TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........42 46 35 31 23 26 16 27 25 38 35 33 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Temp............57 56 58 57 61 61 61 61 61 60 60 59 Dewpoint........52 52 51 51 51 52 52 53 53 53 53 54 RH..............83 86 77 80 70 72 72 75 75 78 78 83 Heat index (F)..57 56 58 57 61 61 61 61 61 60 60 59 20 FT wind dir..E E E E E E SE SE SE SE S S 20 FT wind spd..12 12 12 12 12 13 12 12 12 12 12 12 20 FT wind gust.14 14 14 14 16 17 17 17 17 17 17 16 Surface wnd dir.E E E E E E SE SE SE SE S S Surface wnd spd.12 12 12 12 12 13 12 12 12 12 12 12 Surface wnd gst.14 14 14 14 16 17 17 17 17 17 17 16 Mix hgt (kft)...0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 Transp wind dir.E E E E E E E SE SE SE S S Transp wind spd.17 15 14 13 13 13 13 12 12 12 12 14 LVORI...........4 4 4 4 4 4 4 4 4 4 4 4 ADI.............19 16 15 14 14 14 14 13 13 13 13 15 Vrate kt-ft/1K..6 5 5 4 5 4 4 4 4 4 4 5 Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR Ceiling (kft)...25 25 25 25 25 25 25 25 25 20 20 20 .TONIGHT... Sky/weather.........Partly cloudy then becoming mostly cloudy. Patchy fog around midnight. CWR.................1 percent. Min temperature.....Around 55. Max humidity........100 percent. Dewpoint............54. Max apparent temp...58. Surface winds (mph).Southwest winds 12 to 17 mph. Wind (20 ft)........Southwest winds 12 to 17 mph. Mixing height.......300 ft AGL. Transport winds.....Southwest 14 to 21 mph. Smoke dispersal.....Poor (4400 knot-ft). LVORI...............5. ADI.................13 to 21. CEILING (KFT).......20 decreasing to 2.5, then decreasing to 1.0 increasing to 6.0 increasing to 11 increasing to 15 after midnight increasing to 20 increasing to 25 early in the morning. TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM Sky (%).........35 57 55 65 73 77 Weather cov..... PATCHY PATCHY PATCHY Weather type....NONE NONE NONE FOG FOG FOG Tstm cov........ CWR.............0 0 0 0 0 0 Temp............58 57 56 56 56 57 Dewpoint........54 54 55 55 55 55 RH..............86 90 96 96 96 93 Heat index (F)..58 57 56 56 56 57 20 ft wind......S 12 S 12 SW 13 SW 14 SW 15 SW 16 20 ft wind gust.16 14 15 16 17 18 Surface wind....S 12 S 12 SW 13 SW 14 SW 15 SW 16 Surface wnd gst.16 14 15 16 17 18 Mix hgt (ft)....400 400 400 400 400 400 Transport wind..S 14 S 15 S 17 SW 17 SW 20 SW 21 LVORI...........4 5 5 5 5 5 ADI.............15 13 15 15 18 19 Vrate kt-ft/1K..5 5 6 6 7 8 Ventrate Cat....POOR POOR POOR POOR POOR POOR Ceiling (kft)...20 20 2.5 6.0 15 20 .TUESDAY... Sky/weather.........Partly sunny. Patchy fog early in the morning. Patchy fog in the late morning and early afternoon. CWR.................1 percent. Max temperature.....Around 72. Min humidity........75 percent. Dewpoint............56. Max apparent temp...65. Surface winds (mph).Southwest winds 17 to 23 mph. Wind (20 ft)........Southwest winds 17 to 23 mph. Mixing height.......500 ft AGL. Transport winds.....Southwest 20 to 24 mph. Smoke dispersal.....Poor (6900 knot-ft). LVORI...............6. ADI.................1 to 27. CEILING (KFT).......20 decreasing to 12 early in the morning, then decreasing to 5.3 early increasing to 11 late in the morning increasing to 16 increasing to 21 early decreasing to 16 decreasing to 9.9 late in the afternoon decreasing to 3.8. TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Sky (%).........73 52 37 52 53 63 Weather cov.....PATCHY PATCHY PATCHY PATCHY Weather type....FOG NONE FOG FOG FOG NONE Tstm cov........ CWR.............0 0 0 0 0 0 Temp............57 58 58 59 65 63 Dewpoint........55 56 56 56 57 56 RH..............93 93 93 90 75 78 Heat index (F)..57 58 58 59 65 63 20 ft wind......SW 17 SW 17 SW 18 SW 21 SW 22 SW 23 20 ft wind gust.20 20 23 25 26 28 Surface wind....SW 17 SW 17 SW 18 SW 21 SW 22 SW 23 Surface wnd gst.20 20 23 25 26 28 Mix hgt (ft)....400 400 500 400 400 500 Transport wind..SW 21 SW 21 SW 21 SW 22 SW 24 SW 24 LVORI...........5 5 5 4 4 6 ADI.............23 23 23 24 27 1 Vrate kt-ft/1K..7 7 8 8 9 11 Ventrate Cat....POOR POOR POOR POOR POOR POOR Ceiling (kft)...20 5.3 16 21 22 9.9 $$ Forecaster...KJC Requested by...Alex Entrup Type of request...PRESCRIBED .TAG 2613843.0/BOX .DELDT 05/18/26 .FormatterVersion 2.0.0 .EMAIL alex.entrup@mass.gov